Virginia Giuffre would have viewed Prince Andrew giving up his titles "as a victory", the ghostwriter of her posthumous memoir told BBC Newsnight.
The book, Nobody's Girl, co-written by Amy Wallace, details Ms Giuffre's encounters with convicted sex offender Jeffrey Epstein and his former girlfriend Ghislaine Maxwell - and more details of her allegations about Prince Andrew, which he has always denied.
In the memoir - released on Tuesday - Ms Giuffre described three occasions where she alleged Prince Andrew had sex with her.
Ms Wallace spent four years writing the book with Ms Giuffre, who took her own life almost six months ago.
In the book, Ms Giuffre said she had sex with Prince Andrew on three separate occasions. She says the third occasion was on Epstein's island as part of what Ms Giuffre called "an orgy" with Epstein and approximately eight other young women.
